Evaporator



Patented Mar. 7, 1933 UNITED STATES PATENT OFFICE' FRANKLIN G. SLAGEL,OF BO'FFALO, NEW YORK, ASSIGNOR T FEDDERS MANUFACTUR- me COMPANY, INC 01BUFFALO, NEW

YORK, A CORPORATION OF NEW YORK EVAPORATOR Application filed August 13,1930. Serial No. 475,032.

This invention relates to mechanical refrigerating systems and moreparticularly to evaporators. v

An object of my invention is to provide an evaporator unit forrefrigerating systems which provides a plurality of fluid freezing'chambers as well as abstracting heat from a medium circulating adjacentthereto.

Another object of the invention is to pro; vide an evaporator forrefrigerating'systems in which a plurality of freezing chambers areformed by tube loops extending from one end of a header.

A further object of the invention is to provide a plurality ofsuperposed freezing chambers formed by a header and the associationtherewith of the tube loops bent to extend vertically and thenhorizontally.

Other objects of the invention will appear from the followingdescription taken in connection with the drawing, which forms a part ofthe specification, and in which:

Fig. l is a side elevational view of an evaporator incorporating theinvention, a portion of the header being broken away to show therefrigerant control mechanism.

Fig. 2 is an end elevation of the evaporator. Fig. 3 is a View lookingat the bottom of the evaporator.

Referring now to the drawing by characters of reference, the headercomprises a' cylindrical shell 10 open 'at one end, and a closure plate11 secured in leak proof relation with the open end of the shell. Anoutlet passage 12 extends through the upper portion of the end plate,and an outlet tube 13 is secured in such passage and extends interiorlyof the header. Secured to the end plate by bolts 14, in communicationwith the outlet passage, is a union 15 which is connected withthecompressor (not shown) of a compressor-condenser-evaporatorrefrigerating system. An inlet passage 16 extends through the lowerportion of the end plate, and a. union 17 is secured to the exterior ofthe end plate by bolts 18 in open communication with the inlet passage.The union 17 is connected with the condenser (not shown) of therefrigerating system.

Automatic means is provided interiorly of A that the horizontal theheader to maintain a substantially constant body of liquid refrigerantin the evaporator. A valve seat 19 is arranged in the inlet passage inthe end plate and a needle valve 20 is reciprocated by an open float 21to open and closethe passage through the valve seat member. The float ispivoted at 22 to the end plate and the needle valve is connectedthereto. As the liquid refrigerant in the evaporator vaporizes the floatlowers with the liquid body level .thus moving the valve away fromclosing relation with the seat member, while apredeterminedbody levelraises the float to cause the valve to seat and stop the liquid flowthrough the inlet passage. The tube 13 is bent to extend into the openfloat, and oil collecting linthe float as well as .gasified refrigerantare drawn through the portion 25 is bent to extend horizontally be-'neath the header in the form of double reverse loops. The verticallyextending legs of the tubes are of different lengths relatively soportions are superposed, thus defining a plurality of freezing spaces.The ends of each tube extend preferably through the rear end of theheader so that they are in communication with the body of liquidrefrigerant therein, the tubes being secured to the header by solderingor other suitable means.

A rectangular sheet metal sleeve 30 is arranged intermediate adjacenthorizontal tube sections, and in intimate contact therewith, to formenclosures for receiving pans 31. The pans are adapted to contain fluidto be frozen and can be inserted through the front end of the sleeves. Abrace 32 extends between the upper sleeve and the front end of theheader. I

It will be seen that the evaporator consists essentially of a header andtubes, and that the tubes are entirely supported by the rear end of theheader. A plurality of freezing chambers are formed wlth a minimumnumber of tubes and interposed sleeves.

Although this invention has been described 5 in connection with certainspecific embodiments, the principles involved are susceptible ofnumerous other applications which will readily occur to persons skilledin the art, and the invention is therefore to be limited only asindicated by the scope of the appended claims.

What I claim is: 1. In an evaporator for refrigerating systems, aheader, means for automatically controlling liquid refrigerant tomaintain a body thereof in the header, means for removing gasifiedrefrigerant from the header, and a plurality of tubes having their endssecured to and extending through the rear end of the header below thelevel of the body of refrigerant, said tubes each being bent to formhorizontally extending loops, the horizontal loops of the respectivetubes being in respective superposed horizontal planes.

2. In an evaporator for refrigerating systems, a header, means formaintaining a body of liquid refrigerant in the header, means for tubessecured to the rear end of the header in communication with the body ofliquid refrigerant, said tubes having vertically extending legs andhorizontally extending parallel loop portions intermediate the legs,said legsof the tube being of different length, and sleeves intermediatethe horizontal loops of the tubes and in intimate contact therewith.

6. In an evaporator for refrigerating systems, a header, means formaintaining a body of liquid refrigerant in the header, means forremoving gasified refrigerant from the header, a plurality of tubeshaving their ends connected to the header and in communication with theliquid body of the header, said tubes having parallel leg portions andbent horizontally extending loop portions, the horizontal loops of therespective tubes being in respective superposed horizontal planes, theleg portions of the several tubes being of different lengths forproducing a plurality of freezing chambers by the superposed arrangementof horizontal loop portions.

In test mony whereof I affix my signature.

FRANKLIN G. SLAGEL.

removing gasified refrigerant from the header, a plurality of tubeshaving their ends secured to and extending through the rear end of theheader below the level of the body of refrigerant, said tubes each beingbent to form horizontally extending loops, the horizontal loops of therespective tubes being in respective superposed horizontal planes, andsleeves intermediate the horizontally extending loops and in intimatecontact therewith.

3. In an evaporator for refrigerating systems, a header, means formaintaining a body of liquid refrigerant in the header, means forremoving gasified refrigerant from the heador, and a plurality of tubeshaving their ends extending through and secured to the rear end of theheader in communication with the body of refrigerant, said tube endportions extending vertically and the central portions being. looped andextending in superposed horizontal planes beneath the header.

4. In an evaporator for refrigerating systems, a horizontally extendingheader, means for maintaining a body of liquid refrigerant in theheader, means for removing gasified refrigerant from the header, and aplurality of tubes having their ends secured to and extending throughthe rear end of the header in communication with the body of liquidrefrigerant, said tubes having vertically extending legs andhorizontally extending reverse looped portions intermediate 60 thevertically extending legs.

5. In an evaporator for refrigerating systems, a horizontally extendingheader, means for maintaining a body of liquid refrigerant in theheader, means for removing gasified 65 refrigerant from the header, aplurality of

